Photic sneeze reflex is a rather annoying disorder which is characterized by nearly uncontrollable, reflexive fits of sneezing. Patients with this affliction are seized by paroxysms of sneezing provoked by bright light usually sunlight. This disorder is also known as ACHOO syndrome or helio-ophthalmic outburst syndrome. Photic sneeze reflex is a genetic condition. Anyone who has the gene that causes photic sneeze reflex has a 50 percent chance of passing the gene on to their children.
This genetic defect is estimated to affect between 18 to 35 percent of the world population. Photic sneeze reflex (PSR) or ACHOO (autosomal dominant compulsive helio-ophthalmic outbursts of sneezing) syndrome has been a recognized genetic condition for about 25 years, though publications in medical journals are rare. Most people with this affliction sneeze a set number of times, generally two or three, but there are recorded cases of up to 40 consecutive sneezes.
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